SIB1 Scheduling Optimization for 5G UE Power Efficiency

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Solution Overview

Problem

Current wireless communication systems, particularly in 5G NR, face challenges in optimizing the scheduling of System Information Block Type 1 (SIB1) to balance power consumption and timely status updates, leading to potential radio link failures and inefficient resource utilization.

Innovation Solution

The proposed solution involves a method where user equipment (UE) and network nodes synchronize SIB1 scheduling by reading and decoding SIB1 once per modification period, adjusting timers based on SIB1 timeout and geographical scope, and optimizing the reading frequency to avoid frequent decoding and reduce power consumption, ensuring timely updates and successful RACH procedures.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If SIB1 is frequently monitored and decoded to ensure timely system information updates, then system information freshness is improved, but power consumption increases

Engineering Contradiction:

Improvesystem information freshnessVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent implements periodic monitoring of SIB1 at modification period boundaries instead of continuous monitoring. The UE determines modification period boundaries based on SFN and modificationPeriodCoeff from SIB1, then monitors only at these periodic intervals. This periodic action ensures system information freshness while significantly reducing power consumption compared to continuous monitoring.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent uses preliminary timing information from SIB1 (modificationPeriodCoeff and sfm) to pre-calculate modification period boundaries before actual SIB1 transmission. This preliminary action allows the UE to know in advance when to monitor SIB1, enabling efficient power management by sleeping between predetermined monitoring points rather than continuously checking for updates.

Inventive Principle:

Principle #10Preliminary action

2Use of energy by moving object

If SIB1 monitoring is reduced to save power, then power consumption is reduced, but radio link failure risk increases

Engineering Contradiction:

Improvepower consumptionVSAvoidradio link stability

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The patent maintains radio link stability through periodic monitoring at modification period boundaries while reducing overall monitoring frequency. By calculating precise timing based on modificationPeriodCoeff and sfm, the UE ensures it catches SIB1 updates when transmitted, balancing power savings with reliable link maintenance.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent implements feedback mechanisms where the UE monitors PDCCH for DCI format 1_0 with SI-RNTI at periodic intervals to detect SIB1 transmission indications. This feedback loop ensures the UE responds to actual network transmissions, maintaining reliability while operating at lower power through reduced monitoring frequency.

Inventive Principle:

Principle #23Feedback

3Reliability

If SIB1 is read multiple times per modification period to ensure reliable reception, then reception reliability is improved, but processing overhead increases

Engineering Contradiction:

ImproveSIB1 reception reliabilityVSAvoidprocessing overhead

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent reduces processing overhead by implementing single reading per modification period instead of multiple readings. The UE calculates the exact modification period boundary using SFN and modificationPeriodCoeff, then performs a single SIB1 read at that boundary. This periodic single-read approach maintains reliability by ensuring the UE catches transmitted SIB1 while minimizing processing complexity.

Inventive Principle:

Principle #19Periodic action

4Use of energy by moving object

If SIB1 scheduling is optimized for power efficiency, then power consumption is reduced, but timing synchronization complexity increases

Engineering Contradiction:

Improvepower consumptionVSAvoidtiming synchronization complexity

Core Design Contradiction:

Use of energy by moving objectVSDevice complexity

Solution Approach 1:

The patent manages timing synchronization complexity through standardized periodic calculation based on modificationPeriodCoeff and sfm parameters from SIB1. The UE applies the formula (SFN × modificationPeriodCoeff + sfm) mod (1024 × modificationPeriodCoeff) = 0 to determine monitoring points. This standardized periodic approach balances power efficiency with manageable synchronization complexity using well-defined mathematical relationships.

Inventive Principle:

Principle #19Periodic action

Data Source

PatentUS20220369089A1Optimized SIB1 scheduling

Publication Date: 2022.11.17 QUALCOMM INC

AI summary

The present disclosure relates to methods and devices for wireless communication including an apparatus, e.g., a UE and/or a network node. In one aspect, the apparatus may monitor for at least one SIB1 from a network node. The apparatus may also receive, from the network node, at least one SIB1, the at least one SIB1 being associated with scheduling information for other system information including at least one of a SIB type, an SI periodicity, SI window information, or validity information. The apparatus may also read the at least one SIB1 after reception from the network node, the at least one SIB1 being read once for each modification period of a plurality of modification periods. The apparatus may also decode the at least one SIB1 based on reading the at least one SIB1 once for each modification period.